Note Episode 4 - Death

Half of the user’s remaining lifespan in exchange for the ability to see anyone's name and lifespan just by looking at them.

Light ultimately declines. His reasoning is purely ego-driven—he intends to "reign as a god" of his new world for a very long time, and cutting his life short would limit his "divine" rule. 2. Testing the Limits: The Science of Death Death Note Episode 4

Light doesn't just use the Death Note; he experiments with it like a scientist. In this episode, he uses six incarcerated criminals to test how much control he has over their actions before they die. Half of the user’s remaining lifespan in exchange